# Is there a way to calculate thrust without running experiments?

Is there any way to calculate the thrust generated without conducting experiments? In my case I need to figure out thrust generated by electric duct fans and/or turbojets.

• A real world set up or some theoretical motor? – Ron Beyer Apr 30 '17 at 2:18
• Yes, but you have to know more than is indicated in your question. – mongo Apr 30 '17 at 2:54

For the case of an electric motor driving a propeller, you can get a rough approximation for the thrust t from the power p consumed by the motor when the plane is flying with a constant velocity v, since $p = t \times v$. Of course, you should use coherent units, as newtons, m/s and watts, and include a large correction factor, as the real efficiency will be very far from 100%...